DiagBox from version 7.57 to 7.58 is a standard procedure for users of PSA Peugeot Citroën diagnostic software who need improved ECU compatibility for vehicles built around 2013–2015. While 7.57 is generally stable, the 7.58 update often resolves minor "dialogue" issues where the software may fail to natively recognise certain newer engine control units (ECUs). Key Benefits of the 7.58 Update Improved Vehicle Recognition
Upon opening Diagbox, the dreaded "Server Connection Failed" message appeared, followed by a total corruption of the program. Version 7.58 wouldn't launch, and 7.57 was gone. diagbox 757 to 758 download free